JPH07109095B2 - Construction method of pillar type underground continuous wall - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used as a soil retaining wall in the field of civil engineering and construction, by pouring cement solution into the ground from the auger tip of a multi-axis auger machine, and mixing it with soil and sand with a cement cement solution. It relates to the method of constructing an underground continuous wall.

[0002]

2. Description of the Related Art In the prior art, a multi-axis auger machine is generally a three-axis auger machine, and the construction order by this is
For the purpose of completely connecting the joint portions of the respective elements, as shown in FIG. 5, the distance between the first element and the third element is set so that the auger holes at the both ends of the second element respectively correspond to the first element and the third element. The second element was constructed in such a manner that the soil cement of the first element and the third element was uncured so as to be overlapped with the opposite end auger holes.

That is, in the conventional three-axis auger machine, due to the imbalance of the rotational force of each auger shaft, a slight wall twist is inevitably generated or dragged toward the uncured soil cement hole of the existing element. As a means to prevent this, when constructing the second element, the opposite end auger holes of the first and third elements to be connected are used as excavation guide rulers, so double digging is performed. It is unavoidable and uneconomical, and the construction efficiency must be reduced.

[0004]

DISCLOSURE OF THE INVENTION The present invention eliminates the joining method between elements by the double digging method, which was a drawback of the conventional construction method, and allows the existing elements to be joined completely. It aims to develop an economical and highly efficient construction method.

[0005]

The construction sequence of the present invention is shown in FIG.
Shown in. As the construction machine, as shown in FIG. 1, a multi-axis auger machine with guide plates in which guide plates having a circular arc cross section are arranged on both outer sides along the axial direction of the auger machine, or on both outer sides Using a multi-axis auger machine 6 with a guide plate, such as a multi-axis auger machine with a casing, which is connected to the front and rear surfaces of a multi-axis auger machine with vertically arranged guide plates having an arc-shaped cross section, Third,
In a core material frame made of H steel, which is assembled by connecting several H steels 5 used in the fifth and other preceding elements in parallel in parallel, as shown in FIG. A core in which ruler plates 1, 1 ′ and 2, 2 ′ projecting outward from both flange surfaces from the tips of both flanges of the H steel 5 located on the side are fixed in the length direction of the H steel. The material frame 3 is produced, and these are vertically inserted into the soil cement of the preceding element, and when the trailing elements such as the second, fourth, etc. are constructed, as shown in FIG. The outer surfaces of the guide plates 7 and 7'installed on both sides are the first
It is sandwiched by four ruler plates 1 and 1'of the element and ruler plates 2 and 2'of the third element, and when these ruler plates are slid to proceed with excavation, two times as in the conventional construction method are performed. Not only can the digging be abolished, but also the H elements on both sides of the second element can be installed, so that the connection with the existing element is complete and the installation can be performed efficiently.

[0006]

The operation sequence of the present invention is as shown in FIG. 4, in which the intervals of the preceding elements such as the first, the third, the fifth and the like are taken as the unit elements for the construction, and the core is made of H steel having the above-mentioned ruler plate. The timber frames have been vertically inserted into their soil cement.

At the time of constructing the trailing elements of the second, fourth, etc., since the soil cement of the preceding element is semi-cured or cured, the core material frame 3 inserted at that time is treated by the cured soil cement. Since it is fixed, the ruler plate fixed to the H steel as the core material can sufficiently serve as a guide ruler for the guide plates 7 and 7'when the trailing element is constructed.

Further, since the ruler plates 1, 1 ', 2, 2', etc. have hardened or semi-hardened soil cement behind them, even thin plates can serve as a ruler plate. Since the ruler plate is fixed over almost the entire length of the steel, the guide plate of the multi-axis auger machine is guided to a predetermined depth.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described with reference to the drawings. First, referring to FIG.
A three-axis auger machine having an agitator blade 9 at an appropriate interval as shown in (A) is provided on both outer sides along the agitator shafts 8 at both ends, along the outer periphery of the auger drilling hole, and has a circular arc-shaped section and a length of 3 to 5 m 3-axis auger machine equipped with guide plates 7 and 7'having a certain height,
Alternatively, as shown in FIG. 1 (B), the present inventor firstly, for example, a multi-axis auger machine with a casing in which the auger machine is surrounded by connecting the guide plates 7 and 7'on both sides thereof with the plate material over both side edges. The multi-axis auger machine 6 with a guide plate shown in Japanese Patent Application No. 5-31752 and Japanese Patent Application No. 5-43031, which have been developed and applied, are used.

Multi-axis auger machine 6 with the guide plate
3) as a stress core material to be inserted into the uncured soil cement of the preceding elements such as the first, third, fifth, etc. when constructing an underground underground wall with soil cement at a predetermined interval. The H steel of the book, as shown in FIG. 3, before the insertion, the assembly plate 4 so as to keep the required space accurately.
Then, the core material frame 3 is manufactured by tightly fixing. For this production, Japanese Patent Application No. 5-2758 previously developed by the present inventor
The core material frame manufacturing apparatus in No. 15 can be used.

In manufacturing this core material frame, from the tips of both flanges of H steel located on both outer sides of the frame,
Ruler plates 1, 1 ', 2, 2'projecting obliquely outward
Etc. are welded to the flange over substantially the entire length of the H steel, but the tip of the ruler plate is to the outer edge of the drilling auger.

The H steel used generally has a height of 300 to 40.
The ruler plate is 0 mm, the flange width is 150 to 200 mm, and the thickness of the ruler plate is 3 to 4 mm.

As shown in FIG. 4, the construction sequence is as follows. First, the first element is constructed, the second element connected thereto is skipped, the third element is constructed, and the fourth element is further constructed. 5 elements are constructed and proceeded, but when the construction of soil cement is completed for each element, the core material frame 3 described above is vertically attached to each element, and
Insert it with a crane at the specified position exactly.

After about 1 to 2 days, the soil cement liquid of the preceding element becomes semi-hardened or hardened, and the H steel of the core material frame inserted therein is securely fixed. , In the construction of the fourth element, etc., it is in a state where it can sufficiently fulfill the role of a guide ruler for the guide plates 7, 7'of the triaxial auger machine.

Then, the triaxial auger machine with a guide plate is moved to the position of the second element, and as shown in FIG. 2, the guide plates 7 and 7'are the ruler plate 1 of the core material frame of the first element. , 1'and the ruler plates 2, 2'of the third element, they are inserted by descending from above to determine the position of excavation.

After the above preparations are completed, while the stirring shaft 8 is being rotated, the cement solution is discharged from the tip of the stirring shaft to be excavated, and the process proceeds while kneading into soil cement, and the guide plate 7 of the triaxial auger machine, 7'is a ruler plate 1,
It will descend along 1 ', 2, 2', so
The connection can be completely completed without causing a discrepancy in the joining with the first and third existing elements.

After the construction of the second, fourth, etc. soil cement is completed in this way, the core frame required for these elements is inserted, but it is not necessary to weld a ruler plate to this core frame. Or, in some cases, a single H steel is inserted.

[0018]

According to the present invention, the core frame inserted in the preceding element is a semi-hardened soil cement,
Or, after being sufficiently fixed by hardening, the drilling of the trailing element is performed.Therefore, the ruler plate attached to the core material frame of the preceding element reliably guides the guide plate of the multi-axis auger machine. Therefore, unlike the conventional method, it is not necessary to dig the auger hole of the existing element twice in order to prevent water leakage at the joint part and twisting of the wall surface, it is an economical construction method and its construction efficiency is also conventional. It is about 30% higher than the construction method.

[Brief description of drawings]

1A and 1B are front views of an example of a multi-axis auger machine with a guide plate used in the method of the present invention.

FIG. 2 is an explanatory plan view showing a working state of the machine.

FIG. 3 is a perspective view of a core material frame provided with a ruler plate.

FIG. 4 is an explanatory view showing a construction sequence of the method of the present invention.

FIG. 5 is an explanatory view showing a construction order of a conventional method.

[Explanation of symbols]

 1,1 ', 2,2' Ruler plate 3 Core material frame 4 Core material frame assembly plate 5 Core material H steel 6 Multi-axis auger machine with guide plate 7,7 Guide plate 8 Stirring shaft 9 Stirring blade 10 Auger head

Claims (1)

[Claims] 1. When constructing a columnar underground continuous wall using soil cement by a multi-axis auger machine with guide plates having guide plates arranged on both outer sides, first, third,
In a core material frame in which a plurality of H steels used for the fifth and other preceding elements are assembled in parallel, both ends of the flanges of the H steels located on the trailing element side of the second, fourth, sixth, etc. A core material frame in which a ruler plate protruding obliquely outward from the flange surface is fixed in the length direction of the H steel is manufactured, and these are vertically inserted into the soil cement of the preceding element. When constructing row elements, the outer surfaces of the guide plates on both sides of the multi-axis auger machine with guide plates are sandwiched between the ruler plates fixed to the H steel adjacent to the left and right of the element, and these ruler plates slide on each other. However, it is a method of constructing a column-type underground continuous wall that descends and progresses to make continuous soil cement walls.